Warning messages are displayed on the DIC to notify the driver that the status of the vehicle has changed and that some action may be needed by the driver to correct the condition. If there is more than one message that needs to be displayed they will appear one after another. Some messages may not require immediate action but you should press the select button or the trip odometer reset stem on the instrument panel cluster to acknowledge that you received the message and clear it from the display. Some messages cannot be cleared from the display because they are more urgent; these messages require action before they can be removed from the DIC display. The following are the possible messages that can be displayed and some information about them. For information on other DIC messages, see "DIC Warnings and Messages" in the owner manual Index.

42V SWITCH OFF

When a fuse in the 42-volt battery system is blown, the battery cut off (BCO) switch is open or the battery disconnect switch is open, this message will appear. It will clear when the problem is fixed, when the battery disconnect switch is closed or by pressing the DIC select button or the trip reset stem on the instrument panel cluster. The fuse on the 42-volt battery pack can only be replaced and the automatic battery disconnect can only be closed by a qualified service technician. See Fuses and Circuit Breakers and Battery Disconnect Switch and "Instrument Panel Cluster" in the owner manual Index for more information.

120V DISABLED

This message will display when the hybrid's power system is too hot to function in the APO normal mode. This message will display for 10 seconds or until the system cools down. This message will also display for 10 seconds each time the APO is activated while the system is too hot to function. See "Normal Mode" under Auxiliary Power Outlet (APO) System .

120V GROUND FAULT

This message will display when the APO normal or continuous mode turns off due to an electrical ground fault.

When in the normal mode, the message will display for 10 seconds.

When in the continuous mode, the engine will continue to run for five minutes after a ground fault condition is identified and the APO is not reset. The message will be displayed the entire time the engine is running. See "Resetting the Short Circuit, Overload or Ground Fault Detection (GFD) Circuit" under Auxiliary Power Outlet (APO) System .

120V OVERLOAD

This message will display when the APO normal or continuous mode turns off due to an electrical overload fault.

When in the normal mode, the message will display for 10 seconds.

When in the continuous mode, the engine will continue to run for five minutes after an overload condition is identified and the APO is not reset. The message will be displayed the entire time the engine is running. See "Resetting the Short Circuit, Overload or Ground Fault Detection (GFD) Circuit" under Auxiliary Power Outlet (APO) System .

120V READY

This message will display and the light in the APO button will flash when the system is ready/waiting to enter the continuous mode for 30 seconds or until the ignition is turned to LOCK. See "Continuous Mode" under Auxiliary Power Outlet (APO) System .

120V SYSTEM FAULT

This message will display when the APO normal or continuous mode turns off due to a system fault.

When in the normal mode, the message will display for 10 seconds.

When in the continuous mode, the message will display for 60 seconds and the engine will turn off. It will also display for 10 seconds the next time the engine is started until the problem is fixed. See Auxiliary Power Outlet (APO) System .

BATTERY NOT CHARGING

If the hybrid battery system faults or fails (42-volt or 12-volt system), this message will appear on the DIC. The engine auto start/stop feature will be disabled and the battery/charging system light will appear in the instrument panel cluster. See "Battery Warning Light" in the owner manual Index.

Driving with this light on could drain your batteries. Have the electrical system checked as soon as possible. Pressing the select button or the trip odometer reset stem on the instrument panel cluster will acknowledge this message and clear it from the DIC display.

ENGINE AUTO START MODE

When the vehicle is in PARK (P) and the auto stop function is active, this message will display to let you know that the engine may start automatically at any given time. This message will clear when the vehicle is taken out of PARK (P), if the key is turned to LOCK, or when the engine auto starts.

Pressing the DIC select button or the trip odometer reset stem on the instrument panel cluster will also clear the message.

ENGINE COOLANT HOT

If the engine cooling system temperature gets hot, this message will appear on the DIC. Stop the vehicle and let the engine idle in PARK (P) to allow the coolant to reach a safe temperature. This message will clear when the coolant temperature drops to a safe operating temperature. See "Cooling System" in the owner manual Index for more information.

The APO continuous mode will also stop operating when this message comes on. See "Continuous Mode" under Auxiliary Power Outlet (APO) System .

FUEL LEVEL LOW

If the fuel level is low while the APO system is in continuous mode, this message will appear on the DIC and the horn will sound for five seconds every minute for five minutes. Refuel as soon as possible. If the vehicle is left unattended for the full five minute warning, the engine and APO system will shut down, unless the APO button is pressed during the five minute warning period. See "Continuous Mode" under Auxiliary Power Outlet (APO) System .

Pressing the select button or the trip odometer reset stem on the instrument panel cluster will acknowledge this message immediately and clear it from the DIC display. It will also clear itself after five minutes. The low fuel light near the fuel gage will still remain on in either case. See "Fuel Gage" and "Instrument Panel Cluster" in the owner manual Index.

HOOD AJAR

If the hood is not fully closed, this message will appear on the display. Close the hood to clear the message. Pressing the select button or the trip stem on the instrument panel cluster will acknowledge this message and clear it from the DIC display also.

When this message is displayed, the auto start/stop function will not operate with the hood open. If the vehicle is in auto stop mode when this message appears, you will have to restart the engine with the ignition key. See Starting the Vehicle .

OIL PRESSURE LOW

If engine oil pressure is low, this message will be displayed on the DIC. Stop the vehicle as soon as safely possible and do not operate it until the cause of the low oil pressure has been corrected. Check your oil as soon as possible and have your vehicle serviced. See "Engine Oil" in the owner manual Index.

The APO continuous mode will stop operating when this message comes on. The message will reappear for 60 seconds when the vehicle is shut off and 10 seconds when restarted to let you know why the APO continuous mode was canceled. See "Continuous Mode" under Auxiliary Power Outlet (APO) System .

SECURITY

This message, along with the security light on the instrument panel cluster, will appear on the DIC for 60 seconds when a security violation has occurred. The APO continuous mode will cancel at this time . See "Theft-Deterrent Systems" in the owner manual Index.

SERVICE 42V BATTERIES

This message will display when the 42-volt batteries need service or replacement due to age or if a failure condition is present. This message will be displayed for 10 seconds and then will display again each time the ignition key is turned from LOCK to RUN. See Battery for more information.

SERVICE BRAKE SYSTEM

If you hear four short chimes along with the brake system warning light and this message alternating with the SERVICE STEER SYSTEM message, the power assist system is not working. You will still be able to steer and brake, but it will be much more difficult. Pull off the road to a safe location and have your vehicle towed to the nearest dealer for service. See "Brakes," "Brake System Warning Light," and "ABS Brake System Warning Light" in the owner manual Index.

SERVICE STEER SYSTEM

If the SERVICE STEER SYSTEM message is displayed without any chimes, the power assist system will continue to function, but it may be more difficult to steer. Have the steering system serviced as soon as possible. Also, see "SERVICE BRAKE SYSTEM" listed previously.

Messages are displayed on the DIC to notify the driver that the status of the vehicle has changed and that some action may be needed by the driver to correct the condition. Multiple messages may appear one after another.

Some messages may not require immediate action, but you can press any of the DIC buttons on the instrument panel or the trip odometer reset stem on the instrument panel cluster to acknowledge that you received the messages and to clear them from the display.

Some messages cannot be cleared from the DIC display because they are more urgent. These messages require action before they can be cleared. You should take any messages that appear on the display seriously and remember that clearing the messages will only make the messages disappear, not correct the problem.

The following are the possible messages that can be displayed and some information about them.

If your vehicle has the DURAMAX Diesel engine, see the DURAMAX Diesel manual for more information.

CHANGE ENGINE OIL SOON

This message displays when the engine oil needs to be changed. When you change the engine oil, be sure to reset the CHANGE ENGINE OIL SOON message. See Engine Oil Life System for information on how to reset the message. See Engine Oil and Scheduled Maintenance for more information.

CHECK TIRE PRESSURE

If your vehicle has a Tire Pressure Monitor (TPM) system, this message displays when the pressure in one or more of the vehicle's tires need to be checked. This message also displays LEFT FRONT, RIGHT FRONT, LEFT REAR, or RIGHT REAR to indicate which tire needs to be checked. You can receive more than one tire pressure message at a time. To read the other messages that may have been sent at the same time, press the set/reset button or the trip odometer reset stem. If a tire pressure message appears on the DIC, stop as soon as you can. Have the tire pressures checked and set to those shown on the Tire Loading Information label. See Tires , Loading the Vehicle , and Inflation - Tire Pressure . The DIC display also shows the tire pressure values for the front and rear tires by pressing the vehicle information button. See "DIC Operation and Displays (With DIC Buttons)" earlier in this section. If the tire pressure is low, the low tire pressure warning light comes on. See Tire Pressure Light .

CHECK TRAILER WIRING

On vehicles with the Integrated Trailer Brake Control (ITBC) system, this message may display and a chime may sound when one of the following conditions exists:

When this message displays, power is no longer available to the trailer brakes.

As soon as it is safe to do so, carefully pull your vehicle over to the side of the road and turn the ignition off. Check the wiring connection to the trailer and turn the ignition back on. This message clears if the trailer is reconnected. This message also clears if you acknowledge it. If this message still displays, either your vehicle or the trailer needs service. See your dealer.

See "Integrated Trailer Brake Control System" under Towing a Trailer for more information.

DRIVER DOOR OPEN

This message displays and a chime sounds if the driver's door is not fully closed and the vehicle is in a drive gear. Stop and turn off the vehicle, check the door for obstructions, and close the door again. Check to see if the message still appears on the DIC.

ENGINE HOT A/C (Air Conditioning) TURNED OFF

This message displays when the engine coolant becomes hotter than the normal operating temperature. See Engine Coolant Temperature Gage . To avoid added strain on a hot engine, the air conditioning compressor automatically turns off. When the coolant temperature returns to normal, the air conditioning compressor turns back on. You can continue to drive your vehicle.

If this message continues to appear, have the system repaired by your dealer as soon as possible to avoid damage to the engine.

ENGINE OIL LOW ADD OIL

If your vehicle has an oil level sensor, this message displays if the oil level in the vehicle is low. Check the oil level and correct it as necessary. You may need to let the vehicle cool or warm up and cycle the ignition to be sure this message clears. See Engine Oil for additional information.

ENGINE OVERHEATED IDLE ENGINE

Notice: If you drive your vehicle while the engine is overheating, severe engine damage may occur. If an overheat warning appears on the instrument panel cluster and/or DIC, stop the vehicle as soon as possible. See Engine Overheating for more information.

This message displays when the engine coolant temperature is too hot. Stop and allow the vehicle to idle until it cools down. See Engine Coolant Temperature Gage .

See Overheated Engine Protection Operating Mode for information on driving to a safe place in an emergency.

ENGINE OVERHEATED STOP ENGINE

Notice: If you drive your vehicle while the engine is overheating, severe engine damage may occur. If an overheat warning appears on the instrument panel cluster and/or DIC, stop the vehicle as soon as possible. See Engine Overheating for more information.

This message displays and a chime sounds if the engine cooling system reaches unsafe temperatures for operation. Stop and turn off the vehicle as soon as it is safe to do so to avoid severe damage. This message clears when the engine has cooled to a safe operating temperature.

ENGINE POWER IS REDUCED

This message displays and a chime sounds when the cooling system temperature gets too hot and the engine further enters the engine coolant protection mode. See Engine Overheating for further information.

This message also displays when the vehicle's engine power is reduced. Reduced engine power can affect the vehicle's ability to accelerate. If this message is on, but there is no reduction in performance, proceed to your destination. The performance may be reduced the next time the vehicle is driven. The vehicle may be driven at a reduced speed while this message is on, but acceleration and speed may be reduced. Anytime this message stays on, the vehicle should be taken to your dealer for service as soon as possible.

FUEL LEVEL LOW

This message displays and a chime sounds if the fuel level is low. Refuel as soon as possible. See Fuel Gage and Fuel for more information.

HOOD OPEN

This message displays and a chime sounds if the hood is not fully closed. Stop and turn off the vehicle, check the hood for obstructions, and close the hood again. Check to see if the message still appears on the DIC.

LEFT REAR DOOR OPEN (Crew Cab)

This message displays and a chime sounds if the driver's side rear door is not fully closed and the vehicle is in a drive gear. Stop and turn off the vehicle, check the door for obstructions, and close the door again. Check to see if the message still appears on the DIC.

OIL PRESSURE LOW STOP ENGINE

Notice: If you drive your vehicle while the engine oil pressure is low, severe engine damage may occur. If a low oil pressure warning appears on the Driver Information Center (DIC), stop the vehicle as soon as possible. Do not drive the vehicle until the cause of the low oil pressure is corrected. See Engine Oil for more information.

This message displays if low oil pressure levels occur. Stop the vehicle as soon as safely possible and do not operate it until the cause of the low oil pressure has been corrected. Check the oil as soon as possible and have your vehicle serviced by your dealer. See Engine Oil .

PARK ASSIST OFF

If your vehicle has the Ultrasonic Rear Parking Assist (URPA) system, after the vehicle has been started, this message displays to remind the driver that the URPA system has been turned off. Press the set/reset button or the trip odometer reset stem to acknowledge this message and clear it from the DIC display. To turn the URPA system back on, see Ultrasonic Rear Parking Assist (URPA) .

PASSENGER DOOR OPEN

This message displays and a chime sounds if the passenger's door is not fully closed and the vehicle is in a drive gear. Stop and turn off the vehicle, check the door for obstructions, and close the door again. Check to see if the message still appears on the DIC.

REMOTE KEY LEARNING ACTIVE

This message displays while you are matching a Remote Keyless Entry (RKE) transmitter to your vehicle. See "Matching Transmitter(s) to Your Vehicle" under Remote Keyless Entry (RKE) System Operation and DIC Operation and Displays for more information.

REPLACE BATTERY IN REMOTE KEY

This message displays if a Remote Keyless Entry (RKE) transmitter battery is low. The battery needs to be replaced in the transmitter. See "Battery Replacement" under Remote Keyless Entry (RKE) System Operation .

RIGHT REAR DOOR OPEN (Crew Cab)

This message displays and a chime sounds if the passenger's side rear door is not fully closed and the vehicle is in a drive gear. Stop and turn off the vehicle, check the door for obstructions, and close the door again. Check to see if the message still appears on the DIC.

SERVICE 4 WHEEL DRIVE

This message displays if a problem occurs with the four-wheel-drive system. If this message appears, stop as soon as possible and turn off the vehicle. Restart the vehicle and check for the message on the DIC display. If the message is still displayed or appears again when you begin driving, the four-wheel-drive system needs service. See your dealer.

SERVICE AIR BAG

This message displays if there is a problem with the airbag system. Have your dealer inspect the system for problems. See Airbag Readiness Light and Airbag System for more information.

SERVICE BATTERY CHARGING SYSTEM

On some vehicles, this message displays if there is a problem with the battery charging system. Under certain conditions, the charging system light may also turn on in the instrument panel cluster. See Charging System Light . Driving with this problem could drain the battery. Turn off all unnecessary accessories. Have the electrical system checked as soon as possible. See your dealer.

SERVICE BRAKE SYSTEM

This message displays along with the brake system warning light if there is a problem with the brake system. See Brake System Warning Light . If this message appears, stop as soon as possible and turn off the vehicle. Restart the vehicle and check for the message on the DIC display. If the message is still displayed or appears again when you begin driving, the brake system needs service as soon as possible. See your dealer.

SERVICE BRAKES SOON

This message displays if there is a problem with the brake system. If this message appears, stop as soon as possible and turn off the vehicle. Restart the vehicle and check for the message on the DIC display. If the message is still displayed or appears again when you begin driving, the brake system needs service. See your dealer.

SERVICE PARK ASSIST

If your vehicle has the Ultrasonic Rear Parking Assist (URPA) system, this message displays if there is a problem with the URPA system. Do not use this system to help you park. See Ultrasonic Rear Parking Assist (URPA) for more information. See your dealer for service.

SERVICE STABILITRAK

If your vehicle has StabiliTrak® and this message displays, it means there may be a problem with the StabiliTrak® system. If you see this message, try to reset the system. Stop; turn off the engine for at least 15 seconds; then start the engine again. If this message still comes on, it means there is a problem. You should see your dealer for service. The vehicle is safe to drive, however, you do not have the benefit of StabiliTrak®, so reduce your speed and drive accordingly.

SERVICE THEFT DETERRENT SYSTEM

This message displays when there is a problem with the theft-deterrent system. The vehicle may or may not restart so you may want to take the vehicle to your dealer before turning off the engine. See PASS-Key® III+ Electronic Immobilizer Operation for more information.

SERVICE TIRE MONITOR SYSTEM

If your vehicle has the Tire Pressure Monitor (TPM) system, this message displays if a part on the system is not working properly. If you drive your vehicle while any of the four sensors are missing or inoperable, the warning comes on in about 20 minutes. A sensor would be missing, for example, if you put different wheels on your vehicle without transferring the sensors. If the warning comes on and stays on, there may be a problem with the TPM. See your dealer.

SERVICE TRACTION CONTROL

If your vehicle has StabiliTrak®, this message displays when there is a problem with the Traction Control System (TCS). When this message displays, the system will not limit wheel spin. Adjust your driving accordingly. See your dealer for service. See StabiliTrak® System for more information.

SERVICE TRAILER BRAKE SYSTEM

On vehicles with the Integrated Trailer Brake Control (ITBC) system, this message displays and a chime sounds when there is a problem with the ITBC system.

When this message displays, power is no longer available to the trailer brakes.

As soon as it is safe to do so, carefully pull your vehicle over to the side of the road and turn the ignition off. Check the wiring connection to the trailer and turn the ignition back on. If this message still displays, either your vehicle or the trailer needs service. See your dealer.

See "Integrated Trailer Brake Control System" under Towing a Trailer for more information.

STABILITRAK OFF

If your vehicle has StabiliTrak®, this message displays when you turn off StabiliTrak®, or when the stability control has been automatically disabled. To limit wheel spin and realize the full benefits of the stability enhancement system, you should normally leave StabiliTrak® on. However, you should turn StabiliTrak® off if your vehicle gets stuck in sand, mud, ice, or snow and you want to rock your vehicle to attempt to free it, or if you are driving in extreme off-road conditions and require more wheel spin. See If Your Vehicle is Stuck in Sand, Mud, Ice, or Snow . To turn the StabiliTrak® system on or off, see StabiliTrak® System .

There are several conditions that can cause this message to appear.

The message turns off as soon as the conditions that caused the message to be displayed are no longer present.

TIGHTEN GAS CAP

This message may display along with the check engine light on the instrument panel cluster if the vehicle's fuel cap is not tightened properly. See Malfunction Indicator Lamp . Reinstall the fuel cap fully. See Filling the Tank . The diagnostic system can determine if the fuel cap has been left off or improperly installed. A loose or missing fuel cap allows fuel to evaporate into the atmosphere. A few driving trips with the cap properly installed should turn this light and message off.

TIRE LEARNING ACTIVE

If your vehicle has a Tire Pressure Monitor (TPM) system, this message displays when the system is re-learning the tire positions on your vehicle. See DIC Operation and Displays for more information. The tire positions must be re-learned after rotating the tires or after replacing a tire or sensor. See Tire Inspection and Rotation , Tire Pressure Monitor System , and Inflation - Tire Pressure for more information.

TRACTION CONTROL OFF

If your vehicle has StabiliTrak®, this message displays when the Traction Control System (TCS) is turned off. Adjust your driving accordingly. See StabiliTrak® System for more information.

TRAILER CONNECTED

On vehicles with the Integrated Trailer Brake Control (ITBC) system, this message displays briefly when a trailer with electric brakes is first connected to the vehicle.

This message clears itself after several seconds. This message also clears if you acknowledge it. After this message clears, the TRAILER GAIN/OUTPUT display appears in the DIC.

See "TRAILER GAIN/OUTPUT" under DIC Operation and Displays and "Integrated Trailer Brake Control System" under Towing a Trailer for more information.

TRANSMISSION HOT IDLE ENGINE

Notice: If you drive your vehicle while the transmission fluid is overheating and the transmission temperature warning is displayed on the instrument panel cluster and/or DIC, you can damage the transmission. This could lead to costly repairs that would not be covered by your warranty. Do not drive your vehicle with overheated transmission fluid or while the transmission temperature warning is displayed.

This message displays along with a continuous chime if the transmission fluid in the vehicle gets hot. Driving with the transmission fluid temperature high can cause damage to the vehicle. Stop the vehicle and let it idle to allow the transmission to cool. This message clears and the chime stops when the fluid temperature reaches a safe level.

TURN SIGNAL ON

This message displays and a chime sounds if a turn signal is left on for 3/4 of a mile (1.2 km). Move the turn signal/multifunction lever to the off position.

WASHER FLUID LOW ADD FLUID

This message displays when the windshield washer fluid is low. Fill the windshield washer fluid reservoir as soon as possible. See Engine Compartment Overview for the location of the windshield washer fluid reservoir. Also, see Windshield Washer Fluid for more information.

DIC Warnings and Messages Pickup Models Only

The Driver Information Center (DIC) is located on the instrument panel above the steering wheel. The DIC comes on when the ignition is on.

If a problem is detected, a warning message will appear on the display. Pressing the select button or the set/reset button on the DIC buttons, or the trip odometer reset stem for vehicles without DIC steering wheel buttons, will acknowledge some current warning or service messages.

Some messages that your DURAMAX® diesel may show are:

CHANGE FUEL FILTER

This message will appear on the DIC for ten seconds when a fuel filter change is required. See Fuel Filter Replacement for more information.

CLEAN EXHAUST FILTER SEE OWNERS MANUAL NOW

This message will appear on the DIC when an exhaust particulate filter cleaning is required. This message and a chime will sound when vehicle performance is limited. See Diesel Particulate Filter for more information.

COOLANT LEVEL LOW ADD COOLANT

Notice: Engine damage from running your engine without coolant is not covered by your warranty. See "Overheated Engine Protection Operating Mode" in the Index of your owner's manual for information on driving to a safe place in an emergency.

If your vehicle has a low coolant level sensor, this message will appear on the DIC if the engine coolant level is low. Adding coolant to the coolant recovery tank will clear the message. See Cooling System in the owner's manual Index .

ELEVATED IDLE OFF

This message will appear when the elevated idle/exhaust restrictor feature has been turned off. This feature can be turned on or off by pressing the pedals. For more information on the elevated idle/exhaust restrictor feature, see Starting the Diesel Engine .

ELEVATED IDLE ON

This message will appear when the elevated idle/exhaust restrictor feature has been turned on. This feature can be turned on or off by pressing the pedals. For more information on the elevated idle/exhaust restrictor feature, see Starting the Diesel Engine .

###% FUEL FILTER LIFE REMAINING

To access this display, the vehicle must be in PARK (P). If your vehicle has DIC buttons, press the vehicle information button until FUEL FILTER LIFE REMAINING displays. If your vehicle does not have DIC buttons, press the trip stem until FUEL FILTER LIFE REMAINING displays. This display shows an estimate of the fuel filter's remaining useful life. If you see 90% FUEL FILTER LIFE REMAINING on the display, it means 90% of the current fuel filter life remains. The fuel filter life system will alert you to change your fuel filter on a schedule consistent with your driving conditions.

When the remaining fuel filter life is low, the CHANGE FUEL FILTER message will appear on the display. You should change your fuel filter as soon as you can.

FUEL FILTER LIFE RESET

You must reset the FUEL FILTER LIFE REMAINING display after each fuel filter change. It will not reset itself. Also, be careful not to reset the FUEL FILTER LIFE REMAINING display at any time other than when the fuel filter has just been changed because it cannot be reset accurately until the next fuel filter change. The fuel filter life will change to 100% when the system has been reset. To reset the system, press and hold the set/reset button, or the trip stem if there are no DIC buttons, for two seconds while ###% FUEL FILTER LIFE REMAINING is displayed on the DIC. For more information on DIC Vehicle Customization, see "Driver Information Center (DIC)" in your owner manual.

ENGINE POWER IS REDUCED

A computer monitors the operation of the electric accelerator. If the ENGINE POWER IS REDUCED message comes on while you are driving, the computer is indicating that your vehicle has a problem. You should take your vehicle in for service very soon.

SHIFT INHIBITED SELECT N TO RESET

If the transmission is unable to shift into a selected gear, this message will appear on the DIC. The electronic shift position indicator on the instrument panel cluster may blink when this occurs. To make the vehicle shift to the requested gear, you may have to shift back to PARK (P) or NEUTRAL (N) and re-select the desired gear.

WATER IN FUEL SERVICE REQUIRED

This message will come on to warn you if there is water in the diesel fuel system. For more information on how this message works, see Diesel Fuel Requirements and Fuel System .